Sight for firearms.



D. GRANT.

SIGHT FOR FIREARMS.

APPLICATION. FILED JUNE 4,1914.

Patented Mar. 9, 1915.

HE NORRIS PETERS 60., PHO70-LlrHr: V/ASHINU 70M, 0, C.

, UNITED STATES PATENT OFFICE.

DAVID GRANT, OF MIDDLEFIELD, CONNECTICUT, ASSIGNOR TO THE LYMAN GUN SIGHT CORPORATION, OF MIDDLEFIELD, CONNECTICUT, A CORPORATION OF CONNECTICUT.

SIGHT FOR FIREARMS.

Specification of Letters Patent.

Patented Mar. 9, 1915.

Application filed .Tune 4, 1914. Serial N 0. 843,054.

To all whom it may concern Be it known that I, DAVID GRANT, of Middlefield, in the county of Middlesex, and in the State of Connecticut, have invented a certain new and useful Improvement in Sights for Firearms, and do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to a sight for firearms and it has for its object to provide means for locking the folding part of a rear folding sight in the elevated or sighting position.

The invention consists mainly in the novel combination with the hinge bolt of the folding part of the sight, of a radially operating spring-actuated detent, and wedging or chocking means for holding the detent locked in engagement with the sight base and thereby preventing the folding movement of the sight upon its hinge or pivotal axis.

The invention further consists in the novel stop mechanism between the chocking element of the locking mechanism and the base for securing the chocking member in place, and in the arrangement and construction of parts as more fully hereinafter described and claimed.

In the accompanying drawings forming a part of this specification-Figure 1 is a side elevation of a sight embodying my improvements, with dotted lines showing the folding part in depressed position; Fig. 2 is a central cross-section through Fig. 1; Fig. 3 is a side View of the sight with the locking nut and adjusting screw removed; Fig. 4 is a central vertical longitudinal section through the base and sight with the parts in the elevated and locked position; Fig. 5 is a similar section through the joint or folding element of the sight; Fig. 6 is a view of the pivoted bolt in side elevation; Fig. 7 is a plan view of the pivotal bolt taken from below, that is at right angles to that in Fig. 6; Fig. 8 is a cross-section through the holding nut and bolt on the line 88 of Fig. 2; Fig. 9 is a longitudinal section of a modification of the bolt and locking mechanism; Fig. 10 is an end View of the locking element of said modification.

The drawings show a well-known type of rear sight for fire-arms. It'comprises a base 10, adapted to be secured to the stock 'of the fire-arm, having a pair of'vertical perforated ears 11, which receive a hinge journal bolt 12 passed horizontally through them transversely of the axis of the barrel of the fire-arm, and upon which is hinged a part 13, called the joint, which part carries the sight proper 14, and is capable of being folded down on its hinge axis from the vertical Or sighting position shown in Fig. 1, back upon or in contact with the stock as shown by dotted lines in said Fig. 1. In the sight here shown the joint is provided with a hollow or tubular part 15 which receives the sight post 17 vertically movable therein and is slotted on its front side to allow the projection of a rack 18 formed on the sight post, which intermeshes with the threads of the adjusting nut 19, journaled on the tubular part 15, by means of which the sight is adjusted for elevation.

The journal bolt 12, which forms a bearing for the joint 18, to swing upon as the sight is carried from the vertical to the inclined position is formed with a cylindrical journal part 20 which is received in the correspondingly cylindrical eye 21, in the joint, and integral with one end of the said journal bolt is a screw threaded part 22 screwed into one of the ears of the base which is correspondingly screw-threaded for that purpose. The part 20 receives a nut 23 on its projecting end by which the bolt is rigidly secured to the base, stationary and incapable of turning therein. The cylindrical journal of the bolt extends through and is journaled in the opposite ear of the base, and its projecting end or head comprises a loop 21 formed by a member which is bent around in annular configuration and termi nates in a tongue 31 adapted to fit in and engage a radial slot 25 in said cylindrical part. The said looped member is spring tempered and the tongue is normally set in a position exterior to the periphery of the journal of the bolt, but when inserted into the eye of the joint is thereby compressed inwardly and by means of its tension is pressed outwardly against the bearing of the eye of the joint. Said bearing is formed with a notch 125 in its periphery for the engagement of the aforesaid elastic tongue 31, and the journal bearing is adjusted in the base in such position that the tongue will engage the detent notch in the joint when the sight post is in the elevated or operating position and thus hold it firmly in said position but subject however to being pushed over by a certain amount of force applied to it, to the inclined position shown by the dotted lines in Fig. 1. Thus the elastic radially operating detent, by engagement with the notch in the eye of the joint will hold the sight post vertically in its operating position. This action, and operation, and construction of parts are old and well-known. It is desirable that at certain times the sightpost and sight proper may be locked in the aforesaid elevated or vertical, operative position, incapable of being thrown down, and to accomplish this result I have provided means of locking the parts. As shown this comprises a chock or look adapted to be interposed between the elastic detent and the opposite part of the bolt, whereby the detent is prevented from being forced inwardly out of the notch 125. The preferable form of said device consists of a chocking screw 26 inserted axially into the threaded end of the bolt as shown in sectional view in Fig. 2, the inner end of the screw being pointed or made somewhat conical or otherwise shaped to engage with the correspondingly beveled shoulder or end of the spring detent, and the outer end being provided with a knurled operating head 126 for adjusting it. The perforation in the screw threaded end of the hinge bolt is concentric with the periphery of the bolt and is screw-threaded throughout its length to the free end of the detent. The thread of the locking screw is removed for a portion of the distance within the screw-threaded aperture of the bolt, forming a neck 27, upon the screw, and a pin 28 passes radially through the annular part of the screw-threaded end 22 of the bolt in the plane of the nut 23, which by engagement with the inner shoulder formed by the neck of the screw prevents the screw from being backed out of the sight and removed from the hinge bolt screw. For the purpose of securing the pin in place, the hole to receive it in the hinge bolt is drilled by a drill that passes through the nut 23, in a position admitting of the nut being screwed up slightly in the nut and the bolt. Thus, when the pin is placed in position and the nut is subsequently turned slightly past the position of such alinement of the respective apertures of the bolt and nut designed to permit the insertion of the pin, the subsequent nonalinement of the respective apertures and movement of the solid wall of the body of the nut into engagement with the outer end of the pin or superimposed upon it, as shown in Fig. 8, will prevent the displacement of the pin and it will be fastened in place and prevented from removal until the nut is again turned jbackto bring the pin hole of the chocking screw into registration with that of the "hingebolt. 1

A different form of the mechanism for chocking the locking detent is shown 1n Figs. 9 and 10 it comprising a rotatable shaft 32 journaled in the cylindrical unthreaded seat 33 of the bolt 34, and provided 7 with an eccentric projection 35 adapted to be turned into or out of engagement with the spring detent 31 of the loop 24. With the eccentric pin in engagement with the internal side of the tongue 31 and at the limit or dead center of its throw toward the tongue, as shown in Fig. 9, it will be impossible to depress the tongue toward the center of the bolt, thereby chocking it against inward movement. eccentric pin is turned off from its dead center of motion with'reference to'the radial motion of the spring detent, the resulting space provided between the pin and detent permits the inward movement .of the detent and its disengagement from the detent notch of the joint, whereby the joint will be released and free to turn upon its journal as But when the with a neck similar to the locking screw of Figs. 1 to 8, for engagement of the pin 28 to hold the part in its seat.

Having thus described my invention what I claim is- 1. In a sight for fire arms, the. combination of a base, a sight carrying member, a hinge connection between the latter and the base, a latch device comprising a notch-carrying member, and a detent movable into and out of engagement with the notch of said notch-carrying member, one'of said parts being mounted on the base and the other on the sight-carrying member, and a detent lock movable into and out of engagement with the detent.

2. In a sight for fire arms, the combination of a base, a folding sight part hinged to the base and provided with a detent notch, a detent mounted for engagement with said detent notch, and a detent lock movable into and out of the range of motion ofthe detent.

3. In a sight for fire arms, the combinaice tion of a base having a shoulder, a folding notch, a detent mounted for engagement wlth said detent notch, and a rotatable lockmovable by its rotation into and out of path of'movement of the detent. j

.5. In a sight for fire arms, the combination of a base provided withfa'pair of ears, a cylindrical journal ,bolt mounted through the'ea'rsof the base, a folding'si'ght part the Elli? journaled upon the hinge bolt and provided with a detent notch, and a radially movable detent mounted in the hinge bolt and adapted for engagement with said detent notch, and a chocking part mounted within the hinge bolt and insertible in the path of the detent.

6. In a sight for fire arms the combination of a base, a cylindrical journal bolt mounted on the base having an elastic loop at one endterminating in a detent tongue seated in the journal body of the bolt and radially movable therein to normally project exteriorly to the periphery of the journal, a screw threaded chocking member seated in the bolt adapted to be screwed into engagement with the detent tongue to chock the same in its locking position, the screw being provided with an operating head projecting beyond the bolt, and a folding sight member hinged upon the journal part of the bolt and provided with a detent notch for engagement of the detent when in sighting position. I

7. In a sight for fire arms the combination of a base provided with a pair of vertical perforated ears one of which is screw threaded, a journal bolt secured through the ears, screwed into and projecting through the threaded ear, a lock nut screwed upon the projecting end of the bolt, a radially movable detent seated in the journal portion of the bolt, a chocking screw screwed into the end of the journal bolt with its end interiorly engageable with the detent, and a folding sight part hinged upon the journal part of the bolt and provided with a detent notch for engagement of the detent.

8. In a sight for fire arms the combination of a base provided with a pair of vertical perforated ears one of which is screw threaded, a journal bolt secured through the ears, screwed into and projecting through the threaded ear, having its opposite end formed as a spring loop terminating in a detent tongue seated within the journal body of the bolt, a lock nut provided with a perforation screwed upon the projecting end of the bolt against the base, a chocking element seated in the bolt interiorly engageable with the detent tongue, a stop member in serted radially through said perforation in the locking nut and seated in the journal bolt in engagement with the chocking member to prevent the removal thereof from the bolt, the perforation in the nut for insertion of the stop being positioned out of registration with the seat of the stop when the nut is screwed to place, to insure the retention of the stop in the seat in the normal relation of the parts.

9. In a sight for fire arms, the combination of a base, a journal bolt having a threaded end mounted in the base, a radially movable detent seated in the body of the journal bolt spring actuated to normally project exteriorly to the circumference of the journal, a screw seated lengthwise of the bolt projecting from the threaded end of the bolt and adapted to engage and chock the detent in its exterior position, and a sighting part hinged upon the journal bolt having a detent notch for engagement of the sight part when in sighting position.

10. In a sight for fire arms the combination of a base, a journal bolt having a screwthreaded'cavity mounted in the base having an elastic looped end bent over upon and forming a detent tongue seated in the journal and normally projecting exteriorly to the circumference of the journal, a screw seated lengthwise of the bolt in said screw threaded cavity and extending above the detent, the screw being provided with an operating head and adapted to engage and chock the detent against inward motion, and a sighting part hinged upon the journal bolt having a detent notch for engagement of the sight part when in sighting position. I

In testimony that I claim the foregoing I have hereunto set my hand at Middlefield,

Ct. May 25th 1914.

DAVID GRANT. Witnesses:

GEORGE L. BARNES, HAROLD G. BURNHAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

